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            <h2>
                栅格参数
            </h2>
            <p>通过下表可以详细查看 Bootstrap 的栅格系统是如何在多种屏幕设备上工作的。</p>
            <table class="table table-bordered table-striped">
                <thead>
                <tr>
                    <th></th>
                    <th>
                        超小屏幕
                        <small>手机 (&lt;768px)</small>
                    </th>
                    <th>
                        小屏幕
                        <small>平板 (≥768px)</small>
                    </th>
                    <th>
                        中等屏幕
                        <small>桌面显示器 (≥992px)</small>
                    </th>
                    <th>
                        大屏幕
                        <small>大桌面显示器 (≥1200px)</small>
                    </th>
                </tr>
                </thead>
                <tbody>
                <tr>
                    <th class="text-nowrap" scope="row">栅格系统行为</th>
                    <td>总是水平排列</td>
                    <td colspan="3">开始是堆叠在一起的，当大于这些阈值时将变为水平排列C</td>
                </tr>
                <tr>
                    <th class="text-nowrap" scope="row"><code>.container</code> 最大宽度</th>
                    <td>None （自动）</td>
                    <td>750px</td>
                    <td>970px</td>
                    <td>1170px</td>
                </tr>
                <tr>
                    <th class="text-nowrap" scope="row">类前缀</th>
                    <td><code>.col-xs-</code></td>
                    <td><code>.col-sm-</code></td>
                    <td><code>.col-md-</code></td>
                    <td><code>.col-lg-</code></td>
                </tr>
                <tr>
                    <th class="text-nowrap" scope="row">列（column）数</th>
                    <td colspan="4">12</td>
                </tr>
                <tr>
                    <th class="text-nowrap" scope="row">最大列（column）宽</th>
                    <td class="text-muted">自动</td>
                    <td>~62px</td>
                    <td>~81px</td>
                    <td>~97px</td>
                </tr>
                <tr>
                    <th class="text-nowrap" scope="row">槽（gutter）宽</th>
                    <td colspan="4">30px （每列左右均有 15px）</td>
                </tr>
                <tr>
                    <th class="text-nowrap" scope="row">可嵌套</th>
                    <td colspan="4">是</td>
                </tr>
                <tr>
                    <th class="text-nowrap" scope="row">偏移（Offsets）</th>
                    <td colspan="4">是</td>
                </tr>
                <tr>
                    <th class="text-nowrap" scope="row">列排序</th>
                    <td colspan="4">是</td>
                </tr>
                </tbody>
            </table>
            <br/>
            <blockquote class="bg-gray-light">
                <small>注意 : 以下示例均取自Bootstrap官网,颜色只为区分而已。</small>
            </blockquote>

            <h2>
                实例
            </h2>
            <div class="nav-tabs-custom no-shadow no-margin">
                <ul class="nav nav-tabs">
                    <li class="active">
                        <a data-toggle="tab" href="#tab_1"><i class="fa fa-tag"></i> 从堆叠到水平排列</a>
                    </li>
                    <li><a data-toggle="tab" href="#tab_2"><i class="fa fa-tag"></i> 移动设备和桌面屏幕</a></li>
                    <li><a data-toggle="tab" href="#tab_3"><i class="fa fa-tag"></i> 手机、平板、桌面</a></li>
                    <li><a data-toggle="tab" href="#tab_4"><i class="fa fa-tag"></i> 多余的列（column）将另起一行排列</a></li>
                    <li><a data-toggle="tab" href="#tab_5"><i class="fa fa-tag"></i> 响应式列重置</a></li>
                    <li><a data-toggle="tab" href="#tab_6"><i class="fa fa-tag"></i> 列偏移</a></li>
                    <li><a data-toggle="tab" href="#tab_7"><i class="fa fa-tag"></i> 嵌套列</a></li>
                </ul>
                <div class="tab-content">
                    <div class="tab-pane active" id="tab_1">
                        <p>使用单一的一组 <code>.col-md-*</code>
                            栅格类，就可以创建一个基本的栅格系统，在手机和平板设备上一开始是堆叠在一起的（超小屏幕到小屏幕这一范围），在桌面（中等）屏幕设备上变为水平排列。所有“列（column）必须放在 ”
                            <code>.row</code> 内。</p>
                        <div class="row grid-demo">
                            <div class="col-md-1 bg-green-active">.col-md-1</div>
                            <div class="col-md-1 bg-green">.col-md-1</div>
                            <div class="col-md-1 bg-green-active">.col-md-1</div>
                            <div class="col-md-1 bg-green">.col-md-1</div>
                            <div class="col-md-1 bg-green-active">.col-md-1</div>
                            <div class="col-md-1 bg-green">.col-md-1</div>
                            <div class="col-md-1 bg-green-active">.col-md-1</div>
                            <div class="col-md-1 bg-green">.col-md-1</div>
                            <div class="col-md-1 bg-green-active">.col-md-1</div>
                            <div class="col-md-1 bg-green">.col-md-1</div>
                            <div class="col-md-1 bg-green-active">.col-md-1</div>
                            <div class="col-md-1 bg-green">.col-md-1</div>
                        </div>
                        <div class="row grid-demo">
                            <div class="col-md-8 bg-green-active">.col-md-8</div>
                            <div class="col-md-4 bg-green">.col-md-4</div>
                        </div>
                        <div class="row grid-demo">
                            <div class="col-md-4 bg-green-active">.col-md-4</div>
                            <div class="col-md-4 bg-green">.col-md-4</div>
                            <div class="col-md-4 bg-green-active">.col-md-4</div>
                        </div>
                        <div class="row grid-demo">
                            <div class="col-md-6 bg-green-active">.col-md-6</div>
                            <div class="col-md-6 bg-green">.col-md-6</div>
                        </div>
                    </div>
                    <div class="tab-pane" id="tab_2">
                        <p>是否不希望在小屏幕设备上所有列都堆叠在一起？那就使用针对超小屏幕和中等屏幕设备所定义的类吧，即 <code>.col-xs-*</code> 和
                            <code>.col-md-*</code>。请看下面的实例，研究一下这些是如何工作的。</p>
                        <div class="row grid-demo">
                            <div class="col-xs-12 col-md-8 bg-green-active">.col-xs-12 .col-md-8</div>
                            <div class="col-xs-6 col-md-4 bg-green">.col-xs-6 .col-md-4</div>
                        </div>
                        <div class="row grid-demo">
                            <div class="col-xs-6 col-md-4 bg-green-active">.col-xs-6 .col-md-4</div>
                            <div class="col-xs-6 col-md-4 bg-green">.col-xs-6 .col-md-4</div>
                            <div class="col-xs-6 col-md-4 bg-green-active">.col-xs-6 .col-md-4</div>
                        </div>
                        <div class="row grid-demo">
                            <div class="col-xs-6 bg-green-active">.col-xs-6</div>
                            <div class="col-xs-6 bg-green">.col-xs-6</div>
                        </div>
                    </div>
                    <div class="tab-pane" id="tab_3">
                        <p>在上面案例的基础上，通过使用针对平板设备的 <code>.col-sm-*</code> 类，我们来创建更加动态和强大的布局吧。</p>
                        <div class="row grid-demo">
                            <div class="col-xs-12 col-sm-6 col-md-8 bg-green-active">.col-xs-12 .col-sm-6 .col-md-8
                            </div>
                            <div class="col-xs-6 col-md-4 bg-green">.col-xs-6 .col-md-4</div>
                        </div>
                        <div class="row grid-demo">
                            <div class="col-xs-6 col-sm-4 bg-green-active">.col-xs-6 .col-sm-4</div>
                            <div class="col-xs-6 col-sm-4 bg-green">.col-xs-6 .col-sm-4</div>
                            <!-- Optional: clear the XS cols if their content doesn't match in height -->
                            <div class="clearfix visible-xs-block"></div>
                            <div class="col-xs-6 col-sm-4 bg-green-active">.col-xs-6 .col-sm-4</div>
                        </div>
                    </div>
                    <div class="tab-pane" id="tab_4">
                        <p>如果在一个 <code>.row</code> 内包含的列（column）大于12个，包含多余列（column）的元素将作为一个整体单元被另起一行排列。</p>
                        <div class="row grid-demo">
                            <div class="col-xs-9 bg-green-active">.col-xs-9</div>
                            <div class="col-xs-4 bg-green">.col-xs-4<br>Since 9 + 4 = 13 &gt; 12, this 4-column-wide div
                                gets wrapped onto a new line as one contiguous unit.
                            </div>
                            <div class="col-xs-6 bg-green-active">.col-xs-6<br>Subsequent columns continue along the new
                                line.
                            </div>
                        </div>
                    </div>
                    <div class="tab-pane" id="tab_5">
                        <p>即便有上面给出的四组栅格class，你也不免会碰到一些问题，例如，在某些阈值时，某些列可能会出现比别的列高的情况。为了克服这一问题，建议联合使用
                            <code>.clearfix</code>。</p>
                        <div class="row grid-demo">
                            <div class="col-xs-6 col-sm-3 bg-green-active">
                                .col-xs-6 .col-sm-3
                                <br>
                                Resize your viewport or check it out on your phone for an example.
                            </div>
                            <div class="col-xs-6 col-sm-3 bg-green">.col-xs-6 .col-sm-3</div>

                            <!-- Add the extra clearfix for only the required viewport -->
                            <div class="clearfix visible-xs-block"></div>

                            <div class="col-xs-6 col-sm-3 bg-green-active">.col-xs-6 .col-sm-3</div>
                            <div class="col-xs-6 col-sm-3 bg-green">.col-xs-6 .col-sm-3</div>
                        </div>
                    </div>
                    <div class="tab-pane" id="tab_6">
                        <p>使用 <code>.col-md-offset-*</code> 类可以将列向右侧偏移。这些类实际是通过使用 <code>*</code>
                            选择器为当前元素增加了左侧的边距（margin）。例如，<code>.col-md-offset-4</code> 类将 <code>.col-md-4</code>
                            元素向右侧偏移了4个列（column）的宽度。</p>
                        <div class="row grid-demo">
                            <div class="col-md-4 bg-green-active">.col-md-4</div>
                            <div class="col-md-4 col-md-offset-4 bg-green">.col-md-4 .col-md-offset-4</div>
                        </div>
                        <div class="row grid-demo">
                            <div class="col-md-3 col-md-offset-3 bg-green-active">.col-md-3 .col-md-offset-3</div>
                            <div class="col-md-3 col-md-offset-3 bg-green">.col-md-3 .col-md-offset-3</div>
                        </div>
                        <div class="row grid-demo">
                            <div class="col-md-6 col-md-offset-3 bg-green-active">.col-md-6 .col-md-offset-3</div>
                        </div>
                    </div>
                    <div class="tab-pane" id="tab_7">
                        <p>为了使用内置的栅格系统将内容再次嵌套，可以通过添加一个新的 <code>.row</code> 元素和一系列 <code>.col-sm-*</code> 元素到已经存在的 <code>.col-sm-*</code>
                            元素内。被嵌套的行（row）所包含的列（column）的个数不能超过12（其实，没有要求你必须占满12列）。</p>
                        <div class="row grid-demo">
                            <div class="col-sm-9 bg-green-active">
                                Level 1: .col-sm-9
                                <div class="row grid-demo">
                                    <div class="col-xs-8 col-sm-6">
                                        Level 2: .col-xs-8 .col-sm-6
                                    </div>
                                    <div class="col-xs-4 col-sm-6">
                                        Level 2: .col-xs-4 .col-sm-6
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
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